chapter 6

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Author:
tmp1978
ID:
127676
Filename:
chapter 6
Updated:
2012-01-13 18:53:58
Tags:
pesticides
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Description:
ecology n environmental consideration
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  1. can fish n other wildlife survive great changes in their natural environment?
    no. small changes can greatly reduce chance for survival
  2. when a pesticide evaporates n moves off target, what is it called?
    vapor movement
  3. name 4 of the 8 factors that influence drift?
    • particle size
    • nozzle design
    • orientation
    • pressure
    • temerature
    • humidity
    • evaperation
    • height of release
    • movement
  4. what unique ability does air have which is the cause of pesticide drift?
    air can carry pesticide particles over long distances to drift n settle off target
  5. why should honey bees be protected?
    their work at pollinators is necessary for crop production
  6. how can the use of pesticides affect wildlife?
    pesticide-kills of mammals, birds n fish have occured. pesticides applications can also alter habitat or reduce food supply, thus injuring wildlife.
  7. how do predators accumulate high pesticide residues in their bodies?
    predators eating prey that r carrying accumlative pesticides can accumulate these pesticides as well.
  8. how do pesticides reach groundwater?
    by rain or irrigation water reaching the water table below. also may enter a well directly by spillage or back-siphonage, thus entering the groundwater directly.
  9. when does a pesticide become a pollutant n potentially dangerous?
    when a pesticide drifts off target or are applied over the dose recommended on the label.
  10. how do pesticides reach streams n ponds to cause fish kills or make the water unfit?
    runoff, soil erosion n rainfall.
  11. how should pressure be changed to reduce liquid droplet drift?
    reduce pressure and increase the droplet size. Larger droplets drift less.
  12. what are two possible consequences of pesticide drift onto forage and pastureland or into drinking water?
    people, pets and livestock can be injured by pesticide exposure. pasture grasses could be destroyed. milk or meat could have illegal pesticide residures if cattle eat contaminated forage. water may become too contaminated to drink; aquatic organisms may be destroyed and the cost of cleaning will be very high
  13. can pesticide pollution actually aid the pests you are trying to destroy? How?
    Yes. pesticides can destroy the predators and parasites that naturally control pests
  14. what is an aquifer and why is it important?
    an aquifer is a geologic formation of permeable rock, sand, or gravel that stores large amounts of water. many people use water from aquifers for drinking
  15. what is the name given to the complex prey-predator relationship in which all animals {including man} take part?
    Food chain
  16. the best protection against groundwater pollution is
    prevention
  17. at what level is man in the food chain?
    near the top of the food chain
  18. what is a nonaccumulative pesticide
    nonaccumulative pesticides are ones that do not build up in the bodies of animals or in the tissues of plants
  19. explain the difference between accumulative and persistent pesticides?
    accumulative pesticides slowly build up in the bodies of animals or in the tissues of plants
  20. do persistent pesticides accumulate? Why?
    No. Persistent pesticides remain in the environment without breaking down. this does not mean they also have the necessary characteristics to accumulate in animals or plants
  21. can persistent pesticides be relatively harmless to the environment? Why?
    Yes. persistence is not always bad for the environment, although there have been cases when it was. long lasting or persistent pesticides are important for long-term pretection of structures from termites, for example. there are persistent pesticides that stay on target, control specific pests and cause no adverse environmental impact.
  22. briefly describe the water cycle
    water falls to the earth as precipitation. the precipitation runs off the surface to become surface water. water also seeps through the soil to become groundwater. water goes back into the atmosphere by evaporation and transpiration
  23. what is an endangered species?
    it is a species on the brink of extinction throughout all or a large portion of its range.

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